Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd6a57a00a78308a…

MALICIOUS

PDF

77.7 KB Created: 2021-09-14 04:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 05b414c836a580dcad32e9de5e473d3a SHA-1: 2090d77b91d01918e0de4d62d5b8a86193bc80a9 SHA-256: dd6a57a00a78308a9c02842727cb071148d7f36f3935f2e50fb90a3ce27b9773
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of multiple PDF link farm heuristics confirms this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://123natura.com/stockages/files/43336795519.pdf In PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/8668555379.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe9fe772a6---34887479310.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/11067358407.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/51613732470.pdfIn PDF document text
    • http://hzqzg.com/d/files/kutidoto.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/98482553558.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/22965215394.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/getitobesolosefanubofa.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132870c092e1---lekisitowatozixuzuzab.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/topezavakubimezaxanil.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/lalituzizajegi.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/85748544036.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/20519764267.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/zotubasoxari.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/tovari.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/72704453089.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/vekalefoxasemixoromof.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16139f75196b6d---buwekitiruri.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/kosuvipedowodiban.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/fesasorenowifogule.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/bekawokosorigam.pdfIn PDF document text
    • https://badrivishal.com/media/soposedelusig.pdfIn PDF document text
    • https://ismart99.net/upload/files/vizadalozeg.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/16155010427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=s3+frontier+rebootingPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D8 18136 bytes
SHA-256: b0b4bbd256bc1f3a906bb22ac7ea9e14ef7a68709db233fa8e75e737c4453b8c
font_01_sfnt_off0000f812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF812 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11029 10400 bytes
SHA-256: bf648c92450380f69dd0e4f5f9abce6700416e14a62f8feb6daf57120902cf2a